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Biomedical subjects

M Tavassoli

Publications and source records attributed to M Tavassoli.

At least 289 records · Page 16Linked to original sources
PubMed1974

The structure of spleen in experimentally induced iron deficiency anemia.

Splenic ultrastructure was studied in experimentally induced severe iron deficiency in rabbits. Fragmentation and phagocytosis of blood cells, particularly red cells and platelets, were observed in the red pulp. Mitochondrial changes similar to those previously described in other sideropenic tissues were noted in the lympholytes and reticular cells of both the red and white pulp. The most striking findings were the changes associated with the membranous structures and endoplasmic reticulum. These changes were similar to those characteristically associated with lipid peroxidation. Glutathione peroxidase was shown to be deficient in the red cells of these sideropenic animals. The morphologic changes observed may be explained on the basis of lipid peroxidation of membranes, and it is suggested that iron deficiency results in "deficiency" of enzymes normally responsible for the protection of tissues against peroxidation injury. Increased susceptibility to peroxides may lead to peroxidation injury of membranous structures and morphologic changes described herein.

Anemia, Hypochromic↗
PubMed1973

Fate of the nucleus of the marrow erythroblast.

Nucleated red cells lose their nuclei during passage through the endothelium of marrow sinuses. The passage occurs through cytoplasmic pores which are not gaps at the junction of two endothelial cells but perforations within the endothelium. Enucleation occurs because the pores are of relatively fixed size. Whereas the cytoplasm is flexible and squeezes through the pore, the nucleus is rigid and cannot conform to the pore size. It is, thus, caught, and the red cell becomes enucleated.

Animals↗
PubMed1970

Bone marrow histogenesis: a comparison of fatty and red marrow.

Histogenesis of fatty marrow in extramedullary sites was compared to histogenesis of the red marrow. Both tissues undergo a similar sequence of events leading to reconstruction of hemopoietic marrow nodules. Histogenesis of yellow marrow then continues; such implants become nodules of fatty marrow, whereas implants of red marrow remain hemopoietically active. This observation supports the concept that histogenesis of the bone marrow recapitulates the ontogeny of this organ and indicates an intrinsic difference between the stroma of red and yellow marrow.

Abdominal Muscles↗